634128720080 has 40 divisors (see below), whose sum is σ = 1474588111392. Its totient is φ = 253610397824.

The previous prime is 634128720059. The next prime is 634128720083. The reversal of 634128720080 is 80027821436.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634128720083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142694 + ... + 1135173.

Almost surely, 2^634128720080 is an apocalyptic number.

It is an amenable number.

634128720080 is an abundant number, since it is smaller than the sum of its proper divisors (840459391312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634128720080 is a wasteful number, since it uses less digits than its factorization.

634128720080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284083 (or 1284077 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 634128720080 in words is "six hundred thirty-four billion, one hundred twenty-eight million, seven hundred twenty thousand, eighty".